Patents by Inventor Babu N. Gaddam

Babu N. Gaddam has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydrophilic gel from reactive hydrophilic oligomers
    Patent number: 7659323
    Abstract: Hydrophilic compositions are described, which are prepared from a first oligomer containing pendent polymerizable groups and pendent hydrophilic groups, crosslinked with a co-reactive second component oligomer possessing photoinitiator groups. The compositions may be used as in preparation of hydrophilic gel coatings or layers for medical devices.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: February 9, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Duane D. Fansler, Michael S. Wendland, Steven M. Heilmann, Babu N. Gaddam
  • Acrylic pressure-sensitive adhesives with aziridine crosslinking agents
    Patent number: 7652103
    Abstract: A pre-adhesive composition is described comprising an acid-functional (meth)acrylate copolymer and an aziridine crosslinking agent, which when crosslinked provides a pressure-sensitive adhesive and pressure-sensitive adhesive articles.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: January 26, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Maureen A. Kavanagh, Kelly S. Anderson, Belma Erdogan, Larry R. Krepski, Sanat Mohanty, Timothy D. Filiatrault, Babu N. Gaddam
  • Pressure-sensitive adhesive containing aziridinyl silanes
    Patent number: 7652095
    Abstract: An adhesive composition comprising an emulsion polymer which comprises a (meth)acrylate copolymer, and aziridinyl silane and an optional silica particle component is described. The addition of the aziridinyl silane results in a significant increase in the shear properties, particularly at elevated temperatures.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: January 26, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Timothy D. Filiatrault, Maureen A. Kavanagh, Kelly S. Anderson, Kevin M. Lewandowski, Larry R. Krepski, Babu N. Gaddam
  • Azlactone telechelic polymer
    Patent number: 7649054
    Abstract: A curable composition is described comprising a Michael donor component, a polyacryl component, and 1) an ethylenically unsaturated monomer having a reactive azlactone functional group, or 2) an ethylenically unsaturated monomer having a reactive ring-opened azlactone functional group. A telechelic polymer that is the reaction product of these components is also described.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: January 19, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Duane D. Fansler, Babu N. Gaddam
  • High shear pressure-sensitive adhesive
    Patent number: 7645827
    Abstract: An adhesive composition comprising an emulsion polymer which comprises a (meth)acrylate copolymer and silica nanoparticles is described. The addition of the nanoparticles results in a significant increase in the overlap shear properties of the adhesive while maintaining the peel adhesion.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: January 12, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Timothy D Filiatrault, Kelly S. Anderson, Babu N. Gaddam, Eugene G. Joseph, Ying-Yuh Lu
  • Ring-opened azlactone telechelic polymer
    Patent number: 7642321
    Abstract: A curable composition is described comprising a Michael donor component, a polyacryl component, and 1) an ethylenically unsaturated monomer having a reactive azlactone functional group, or 2) an ethylenically unsaturated monomer having a reactive ring-opened azlactone functional group. A telechelic polymer that is the reaction product of these components is also described.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: January 5, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Duane D. Fansler, Kevin M. Lewandowski, Babu N Gaddam
  • HYDROPHILIC GEL FROM REACTIVE HYDROPHILIC OLIGOMERS
    Publication number: 20090326498
    Abstract: Hydrophilic compositions are described, which are prepared from a first oligomer containing pendent polymerizable groups and pendent hydrophilic groups, crosslinked with a co-reactive second component oligomer possessing photoinitiator groups. The compositions may be used as in preparation of hydrophilic gel coatings or layers for medical devices.
    Type: Application
    Filed: September 8, 2009
    Publication date: December 31, 2009
    Inventors: Kevin M. Lewandowski, Duane D. Fansler, Michael S. Wendland, Steven M. Heilmann, Babu N. Gaddam
  • Reactive hydrophilic oligomers
    Patent number: 7598298
    Abstract: Hydrophilic compositions are described, which are prepared from a first oligomer containing pendent polymerizable groups and pendent hydrophilic groups, crosslinked with a co-reactive second component oligomer possessing photoinitiator groups. The compositions may be used as in preparation of hydrophilic gel coatings or layers for medical devices.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: October 6, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Duane D. Fansler, Michael S. Wendland, Steven M. Heilmann, Babu N. Gaddam
  • ACRYLIC PRESSURE-SENSITIVE ADHESIVES WITH AZIRIDINE CROSSLINKING AGENTS
    Publication number: 20090246390
    Abstract: A pre-adhesive composition is described comprising an acid-functional (meth)acrylate copolymer and an aziridine crosslinking agent, which when crosslinked provides a pressure-sensitive adhesive and pressure-sensitive adhesive articles.
    Type: Application
    Filed: March 27, 2008
    Publication date: October 1, 2009
    Inventors: Larry R. Krepski, Timothy D. Filiatrault, Shaun D. McCracken, Maureen A. Kavanagh, Babu N. Gaddam
  • ACRYLIC PRESSURE-SENSITIVE ADHESIVES WITH AZIRIDINE CROSSLINKING AGENTS
    Publication number: 20090208740
    Abstract: A pre-adhesive composition is described comprising an acid-functional (meth)acrylate copolymer and an aziridine crosslinking agent, which when crosslinked provides a pressure-sensitive adhesive and pressure-sensitive adhesive articles.
    Type: Application
    Filed: February 14, 2008
    Publication date: August 20, 2009
    Inventors: Maureen A. KAVANAGH, Kelly S. Anderson, Belma Erdogan, Larry R. Krepski, Sanat Mohanty, Timothy D. Filiatrault, Babu N. Gaddam
  • Dental compositions containing carbosilane monomers
    Patent number: 7576144
    Abstract: Carbosilane monomers that include the following structural features: at least two Si-arylene bonds; at least one (meth)acrylate moiety; no Si—O bonds; and preferably at least two silicon atoms.
    Type: Grant
    Filed: July 13, 2005
    Date of Patent: August 18, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Ahmed S. Abuelyaman, Babu N. Gaddam, Sumita B. Mitra, Brian N. Holmes, Adrian S. Eckert, Peter Bissinger
  • Ring-opened azlactone initiators for atom transfer radical polymerization
    Patent number: 7557177
    Abstract: Initiators for atom transfer radical polymerizations are described. The initiators have an azlactone or ring-opened azlactone moiety to provide telechelic (co)polymers.
    Type: Grant
    Filed: October 8, 2007
    Date of Patent: July 7, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Duane D. Fansler, Kevin M. Lewandowski, Babu N. Gaddam, Steven M. Heilmann, Larry R. Krepski, Stephen B. Roscoe, Michael S. Wendland
  • CURABLE COMPOSITIONS FOR OPTICAL ARTICLES
    Publication number: 20090156747
    Abstract: A curable composition is provided comprising an oligomer having a plurality of pendent and/or terminal ethylenically unsaturated, free-radically polymerizable functional groups, a free-radically polymerizable crosslinking agent, and/or a diluent monomer, and a photoinitiator. The composition, when cured, is non-yellowing, exhibits low shrinkage and low birefringence making it suitable for many optical applications such as optical lenses, optical fibers, prisms, light guides, optical adhesives, and optical films.
    Type: Application
    Filed: January 29, 2007
    Publication date: June 18, 2009
    Inventors: Ying-Yuh Lu, Jianhui Xia, Peter M. Olofson, Ming Cheng, Mark F. Ellis, Babu N. Gaddam, Kevin M. Lewandowski, Joseph D. Rule
  • Pressure-sensitive adhesive containing silica nanoparticles
    Patent number: 7531595
    Abstract: An adhesive composition comprising an emulsion polymer which comprises a (meth)acrylate copolymer and silica nanoparticles is described. The addition of the nanoparticles results in a significant increase in the overlap shear properties.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: May 12, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Timothy D. Filiatrault, Kelly S. Anderson, Babu N. Gaddam, Eugene G. Joseph, Ying-Yuh Lu, John J. Stofko, Jr.
  • REACTIVE HYDROPHILIC OLIGOMERS
    Publication number: 20090062711
    Abstract: Hydrophilic compositions are described, which are prepared from a first oligomer containing pendent polymerizable groups and pendent hydrophilic groups, crosslinked with a co-reactive second component oligomer possessing photoinitiator groups. The compositions may be used as in preparation of hydrophilic gel coatings or layers for medical devices.
    Type: Application
    Filed: November 4, 2008
    Publication date: March 5, 2009
    Inventors: Kevin M. LEWANDOWSKI, Duane D. Fansler, Michael S. Wendland, Steven M. Heilmann, Babu N. Gaddam
  • Curable compositions containing dithiane monomers
    Patent number: 7495054
    Abstract: The invention features compositions comprising at least one monomer that comprises a cyclic dithiane moiety attached to a (meth)acryloyl moiety. The composition may optionally contain additional polymerizable compounds, such as ethylenically unsaturated compounds, that are typically used in dental compositions.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: February 24, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Ahmed S. Abuelyaman, David J. Plaut, Babu N. Gaddam
  • HARDENABLE SELF-SUPPORTING STRUCTURES AND METHODS
    Publication number: 20090032989
    Abstract: Compositions, particularly for forming dental products, having a hardenable self-supporting structure with sufficient malleability to be subsequently customized into a second shape and then hardened, and methods.
    Type: Application
    Filed: October 13, 2008
    Publication date: February 5, 2009
    Inventors: Naimul Karim, Todd D. Jones, Kevin M. Lewandowski, Duane D. Fansler, James M. Nelson, Marcelino Salviejo-Rivas, Babu N. Gaddam, Ahmed S. Abuelyaman, Sumita B. Mitra
  • Crosslinkable hydrophilic materials from polymers having pendent Michael donor groups
    Patent number: 7473719
    Abstract: The present invention provides crosslinkable compositions useful in the preparation of hydrophilic gels, and are prepared from polymers having pendent hydrophilic groups, and pendant Michael donor groups, and crosslinked by polyacryl Michael acceptor compounds.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: January 6, 2009
    Assignee: 3M Innovative Properties
    Inventors: David J. Plaut, Duane D. Fansler, Kevin M. Lewandowski, Babu N. Gaddam
  • PRESSURE-SENSITIVE ADHESIVE CONTAINING AZIRIDINYL SILANES
    Publication number: 20080319122
    Abstract: An adhesive composition comprising an emulsion polymer which comprises a (meth)acrylate copolymer, and aziridinyl silane and an optional silica particle component is described. The addition of the aziridinyl silane results in a significant increase in the shear properties, particularly at elevated temperatures.
    Type: Application
    Filed: June 20, 2007
    Publication date: December 25, 2008
    Inventors: Timothy D. FILIATRAULT, Maureen A. KAVANAGH, Kelly S. ANDERSON, Kevin M. LEWANDOWSKI, Larry R. KREPSKI, Babu N. GADDAM
  • Reactive hydrophilic oligomers
    Patent number: 7459489
    Abstract: Hydrophilic compositions are described, which are prepared from a first oligomer containing pendent polymerizable groups and pendent hydrophilic groups, crosslinked with a co-reactive second component oligomer possessing photoinitiator groups. The compositions may be used as in preparation of hydrophilic gel coatings or layers for medical devices.
    Type: Grant
    Filed: August 8, 2006
    Date of Patent: December 2, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Duane D. Fansler, Michael S. Wendland, Steven M. Heilmann, Babu N. Gaddam